22 



5. Conulus. Fitz. 



I Diam. 4, alt. 3 mill, (usually smaller) spire conic, 

 sh. microscopically, regular striated above, smooth 

 below, deep amber to almost chestnut colored; 

 whorls 5 to 6. fulvus, Mull- 



— diam. 1.5, alt. i mill.; spire depressed; sh. almost 



smooth, nearly colorless; whorls 3 to 4. sterkii, Dall. 



6. Selenites, Fischer concava, Say. 

 7 Helicodiscus, Mse. lineatus, Say. 



8. Punctum, Mse. 



(P. minutissimumLea) [Eu.J pygmseum, Drap. 



9. Sphyradium, Charp. 



edentulum, Drap. 

 The last whorl sometimes wider than the preceding. 

 (Syn.; Vertigo, or Pupa, simplex Gould.) 



10. Pyramidula, Fitz. 



I diam. 8 mill.; a callus, or tooth in the base of last 

 whorl, at the aperture; rib-stria? somewhat coarse; 

 color deep reddish horn. perspectiva, Say. 



— diam. 6 mill.; no callus in last whorl; rib-strije 



rather fine; color deep brownish horn. 



striatella, Anth. 



II. Patula, Hald. 



I diam. 25, alt. 15 mill.; umbilicus moderate, spire ele- 

 vated; whorls rounded; surface rather finely and 

 irregularly striated; with brownish, revolving 

 bands. solitaria, Say. 



